I'm going to disagree here. With 4e, the Fighter is no longer the "easy mode" character. He's got plenty of options, and a very important, group-centric role. That said, I would suggest playing the Rogue. You already like Rogues and you rolled well (he let you roll stats?!). Also, while the Rogue's role is important, it's somewhat "easier" on a new player because it's more intuitive. You go in, you hit stuff hard, you get away. Maybe you need to coordinate who you hit with the rest of the group, buy it's pretty obvious what to do.
On the other hand, playing a Fighter, sure, you dish out damage, but that's not you "job". Your "job" is to protect the threatened members of the party. It can be easy to lose focus on that when you're chopping guys in half with your scythe, and before you know it, the Wizard is surrounded and the Cleric is down. You've got to consider who needs you most, which monster is the biggest threat, where you need to be for best performance, etc. It's not "hard" to do, really, and I'm sure your party-members will offer suggestions, but it's a more "team" oriented class than the Rogue or the Wizard, IMO.
Plus, you know, Rogues are just cool. 
"If you fudge dice rolls, your system is failing you!" -Sons of Kryos
"I genuinely think that some people measure their free will by reading how unhappy their GM is." - TonyLB
[dice type=fudge]3dF[/dice]